Trimming-cutter for sewing-machines.



J. M. MERROW. TEIMMING CUTTER r011 SEWING MACHINES.

APPLICATION FILED DBO.9,1905.

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Patented Dec. 22, 1908.

steel and rectangular UNTTED STATES PATENT OFFICE.

L JOSEPH M. MERROW, OF HARTFORD, CONNECTICUT, ASSIGNOR TO THE MERROW MACHINE COMPANY, OF HARTFORD, CONNECTICUT, A CORPORATION OF CONNECTICUT.

TRIMMING-C'UTTER FOR SEWING-MACHINES.

Specification of Letters Patent. Patented Dec. 22, 1908. Application filed December 9, 1905. Serial No. 291,132.

T 0 all whom it may concern:

Be it known that I, J OSEPH M. MERROW, a citizen of the United States, residing in the city and county of Hartford, State of Con necticut,haveinvented certainnew anduseful 1 clination to the cutting edge. Improvements in Trimming-Cutters for Sew- The cutter i. is adjustably mounted on a ing-Machines, of which the following is a shim B, the rear face of the cutter A being full, clear, and exact description, reference j provided with guide ways or grooves 00 to fit being had to the accompanying drawings, a tongue I on the front face of the said shim. forming a part of this specification, and to i The said grooves are so disposed as to perthe figures and letters of reference thereon. mit adjustment of the cutting edge a, to

This invention relates to cutters for trimproperly cooperate with the companion cutming or cutting material. ter when reciprocated in the plane in which The object of this invention is to provide a the cutting edge is ground. In the present cutter possessing several cutting edges and a case, there are two grooves a at right angles guard or guide for each cutting edge, any one to each other, one being parallel with two of of said cutting edges with its guide being I the edges of the block and the other being adapted to be used atone time in conjuncparallel with the other two edges of the block tion with a comp anion cutter, and the others or cutter as a whole, thus each guide way or in turn being adapted to be brought into use 1 groove serves to position two cutting edges. one by one as those previously used become The tongue 5 on the face of the shim next worn or dull. The cutting edges and guides to the cutter is preferably vertical as shown, are so arranged that each guide and the 1 so that the cutter may be adjusted bodily up whole face containing the adjacent cutting j and down upon the shim. To permit sucn edge may be ground in a single plane without v adjustment the screw hole a through the changing the form of the cutting edge. body of the cutter is made larger than the In the accompanying drawings forming a body of the screw E which retains the cutter. part of this specificationFigure 1 is a front The horizontal tongue I) on the rear face of elevation of the cutter showing its retaining he shim B fits the groove 0 in the front face screw and a portion of a companion cutter. of the carrier C and the screw hole 6 in the Fig. 2 is a plan view of the cutter and its shimB is slotted to permit the horizontal adcarrier and also shows a shim between the justment of the cutter A bodily, the shim two. Fig. 3 is a side elevation of the parts 1 also moving with the cutter for such adjustshown in Fig. 2. Fig. 4. is a front elevation ment. of the shim. Fig. 5 is afront elevation of the l, It will be understood that the carrier C is cutter detached. Fig. 6 is an elevation of ordinarily moved up and down by any known the cutter as seen from the left hand of Fig. 5. j mechanism suitable for the purpose and that Fig. 7 is an elevation of the cutter as seen the companion cutter D is ordinarily held from the right hand of Fig. 5. stationary on some part of the machine, al-

Similar letters of reference indicate like though no mechanism for moving either of parts throughout the drawings. the cutters or for supporting the companion A indicates the cutter as cutter is shown, as such parts form no part of shim; C, the cutter carrier; the present invention. panion cutter. The cutter A. can be ground upon its edge The cutter A is made from a polygonal faces, each face in a single plane to sharpen block (preferably four sided as shown) of I its cutting edges, and to keep the guides for in cross sections. One j the cutting edges each in the same plane reof its larger faces, which I call its front face, i spectively as its adjacent cutting edge. The is routed out as at a a a a to form cutters path of movement of the cutter A should be with cutting edges at a a, a. a and four practically parallel with the adjacent side of uides a a a o one for each of the cutters the companion cutter and thus the guide and the latter are preferably made at an upon the acting side of the cutter A will alacute angle with the edge or face forming its ways be in contact with the side of the comguide. The routing on the front is prefer panion cutter and will protect the edge a of ably made in a plane parallel with the larger l the cutter from undue conflict therewith.

faces of the block and the side walls left by said routing are at an obtuse angle with bottom wall of the routing, as clearly shown in the figures, thus giving a pitch or ina whole; B, the

and D, the com- With four acute When one of the four cutting edges of the guide for cutter A becomes dull, the cutter may be rotated and another cutting edge a brought into use and so on until all of the cutting edges have been utilized.

Having thus described my invention, What claim as new and desire to secure by Letters Patent, is

1. A polygonal cutter each of the edge 6. A faces of which embodiesacutting edge extendfaces of Which embodies a transverselyextending cutting edge and a guide therefor extending in the same plane, the front face of the said cutter being routed out to form the cutting edges and the rear face of said cutter being provided with guideways corresponding to the said cutting edges, substantially as described.

7. A polygonal trimming cutter having cutting edges and guides therefor on its edge faces each cutting edge and its guide being ground in the same plane and guide Ways on the gear face of the cutter, substantially as decorresponding described.

5. A doubly reversible cutter. having guideways upon one of its faces, substantially as described.

and a guide for the cutting edge extending in the same plane therewith, substantially as described.

2. A polygonal cutter having opposite I edge faces in approximately parallel planes and each embodying a cutting edge extending transversely to the rear face of the cutter and a guide for the cutting edge extending in the plane of one face of the cutting edge of the cutter, substantially as described.

'3. A doubly reversible cutter, having four I edge faces each embodying an acute angle scri cutting edge extending transversely of the cutter and a guide extending in the plane of JOSEPH M. MERROW.

the cutter, each cutting edge and its guide Witnesses: being ground or made in the same plane. ALoNzo M. LUTHER, 4. A doub W. O. W. STEWART.

ly reversible cutter provided polygonal cutter each of the edge I 

